Unit13Wearetryingtosavetheearth.airpollutionnoisepollution1anoisepollution________________________________________________carsHelpsavetheearthYouusealotofnewplasticbags.That’sbadfortheEarth.Youusepaperononesideonly.That’sbadfortheEarth.closedownthefactories;helptocleanuptheriver;takethebusorsubway;rideabike;bringabagtogoshopping,throwrubbishinthecans;turnoffthelightswhenyouleavearoom;usepaperorresusablebags;recyclebooksandpaper;turnofftheshowerwhenyouwashyourhair;don'tusenapkins;1bWhatcausedtheproblem?PointsonP97trytodo=tryone’sbesttodo努力去做某事mobilephones手机rubbish,litter,waste垃圾,废物thebottomoftheriver河底befullof充斥……fisherman-fishermen渔民government政府throwlitterintotheriver把垃圾扔到河里asksb.todo要求某人干某事closedownthefactories关闭工厂cleanup打扫usedtobe…过去经常…playapartin…参加，在……中扮演角色Review努力去做某事手机垃圾,废物河底充斥……渔民政府把垃圾扔到河里要求某人干某事关闭工厂打扫过去经常…在……中起作用，在……中扮演角色2a1.Theairisbadlypollutedbecausethereare________ontheroadthesedays.2.Factoriesthatburncoalalso______theairwithalotofblacksmoke.3.Thereisalsotoomuchrubbishandwaste.People___________________thingseveryday.4.Peoplearealsolitteringin____________likeparks.Thisturnsbeautifulparksintouglyplaces.Interviewer:JasonandSusan,whatareyourideasforsolvingtheseproblems?Jason:Well,tocutdownairpollution,weshouldtakethebusorsubwayinsteadofdriving.Susan:Yeah,orrideabike.Thereareotheradvantagesofbikeriding.It’sgoodforhealthanditdoesn’tcostanything!Interviewer:Greatideas!Whataboutwastepollution?Susan:Mmm,Ithinksimplethingslikebringingabagtogoshoppingcanhelp.Istarteddoingthatayearago.Jason:Me,too.Also,InevertakewoodenchopsticksorplasticforkswhenIbuytakeawayfood.Iusetheonesathome.Susan:Andremembertothrowrubbishinthebinsandkeeppublicplacescleanandbeautifulforeveryone.Interviewer:Sotogether,ouractionscanmakeadifferenceandleadtoabetterfuture!Completethechart.1.It’sgoodforhealthanditdoesn’tcostanything!costv.花费；使付出指花费金钱，主语一般是物。cost旳过去式和过去分词均为cost。take,spend,pay&costtake，spend，pay和cost都能够